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The first character is different, because UTF-16 can encode the E-acute correctly; thereafter, every other byte in the UTF-16 array is zero, and the next byte corresponds to the ASCII value. As we said earlier, the Unicode standard is highly compatible with ASCII, and each 16-bit value (i.e., pair of bytes) corresponds to the equivalent 7-bit value in the ASCII encoding. There s one more note to make about this byte array, which has to do with the order of the bytes. This is easier to see if we first update the program to show the values in hex, using the formatting function we learned about earlier, as Example 10-84 shows.

static void Main(string[] args) { string listenUpFR = " coute-moi!"; byte[] utf16Bytes = Encoding.Unicode.GetBytes(listenUpFR); Console.WriteLine("UTF-16"); Console.WriteLine("-----"); foreach (var encodedByte in utf16Bytes) { Console.Write(string.Format("{0:X2}", encodedByte)); Console.Write(" "); } } Console.ReadKey();

If we run again, we now see our bytes written out in hex format:

AP News + Google Maps (http://www.81nassau.com/apnews) is a very interesting site that is a great example of how mashups use data and APIs from different sources to create a new product (see Figure 1-5). This site displays the Associated Press U.S. National, Sports, Business and Technology, and Strange news stories on top of Google Maps. It retrieves a published RSS feed from the Associated Press web site and translates (using the Yahoo Geo-encoding REST API) the city and state from each story into a latitude and longitude point. Google Maps is used to plot the points on a map.

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What this means for SimpleWebServer is that if a client connects to it and sends a carriage return as its first message, the server will crash! An attacker can deduce this vulnerability in the web server by either studying the code of SimpleWebServer or reverse-engineering the application Once the attacker deduces the existence of the vulnerability, the attacker could then simply cause a DoS attack in which the server can be shut down simply by sending a carriage return to it Service to all legitimate clients would thereafter be denied You might argue that the server simply has a bug in it You would be right The crucial point here is that the server has a bug that can result in a security vulnerability.

But remember that each UTF-16 code point is represented by a 16-bit value, so we need to think of each pair of bytes as a character. So, our second character is 63 00. This is the 16-bit hex value 0x0063, represented in the little-endian form. That means we get the least-significant byte (LSB) first, followed by the most-significant byte (MSB). For good (but now largely historical) reasons of engineering efficiency, the Intel x86 family is natively a little-endian architecture. It always expects the LSB followed by the MSB, so the default Unicode encoding is little-endian. On the other hand, platforms like the 680x0 series used in classic Macs are big-endian they expect the MSB, followed by the LSB. Some chip architectures (like the later versions of the ARM chip used in most phones) can even be switched between flavors!

Another historical note: one of your authors is big-endian (he used the Z80 and 68000 when he was a baby developer) and the other is little endian (he used the 6502, and early pre-endian-switching versions of the ARM when he was growing up). Consequently, one of us has felt like every memory dump he s looked at since about 1995 has been backwards . The other takes the contrarian position that it s so-called normal numbers that are written backwards. So take a deep breath and count to 01.

Should you need to communicate with something that expects its UTF-16 in a bigendian byte array, you can ask for it. Replace the line in Example 10-84 that initializes the utf16Bytes variable with the code in Example 10-85.

byte[] utf16Bytes = Encoding.BigEndianUnicode.GetBytes(listenUpFR);

How would better requirements have potentially eliminated this problem Requirements could have been written for the SimpleWebServer program that specify how it should behave in corner cases For example, such a requirement might read as follows: The web server should immediately disconnect from any web client that sends a malformed HTTP request to the server Upon reading such a requirement, the hope is that a good programmer would take more care to check for malformed HTTP requests While there are an infinite number of malformed HTTP requests that a client could issue, usage of exception handling in Java can help catch many of them Following is a snippet of code to replace the preceding one that checks for malformed HTTP requests and notifies the client if the request is malformed: /* Read the HTTP request from the client */ String request = br.

As you might expect, we get the following output:

static void Main(string[] args) { string listenUpArabic = " ;" byte[] utf16Bytes = Encoding.BigEndianUnicode.GetBytes(listenUpArabic); Console.WriteLine("UTF-16"); Console.WriteLine("-----"); foreach (var encodedByte in utf16Bytes) { Console.Write(string.Format("{0:X2}", encodedByte));

} }

Console.Write(" ");

Console.ReadKey();

readLine(); String command = null; String pathname = null; try {.

Figure 1-5. API News + Google Maps: mashup of the Associated Press RSS feed, Yahoo Geo-encoding, and Google Maps

And our output is:

(Just to prove that you do get values bigger than 0xFF in Unicode!)

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